Triple-phase phenomena during quenches of superconductors cooled by pressurized superfluid helium II

Experimental Study of Three-Phase Helium Mixtures in Confined Channels

“…As a consequence, 𝑞 * is much lower and the vapour film is easily established. It follows that, if He II undergoes 𝜆-transition, the heat flux is likely to be large enough to trigger the firstorder transition too [23], resulting in a stable triple-phase phenomenon [24], [25].…”